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원문 게시자: danny ,


if it is showing padlock when trying to boot to an external drive it means there is a firmware password - if you know the password enter it and boot to dvd

if you don't know the password you need to change the RAM configuration and reset the PRAM to remove the firmware password altogether. you can find info on this on apple support pages

Change RAM config = basically take a stick of ram out of the machine

Reset PRAM =  with ONE RAM stick removed, switch on the machine HOLDING DOWN BUTTONS      CMD + ALT + P + R

wait for the machine to reboot a few times. put ram stick back in and boot to external drive normally.